In order to clarify my cluttered mind, even though the two flights I noted earlier asked for go-arounds, the fact that the flight tracker (I forget which one, FlightStats I think) showed both flights arrived 10 -20 minutes earlier means the JFK Tower transmission was as close to real time as possible and the flight tracking software was in error? Thanks.
Could it be that the flight tracker doesn't track landing but the first approach? That would account for the difference.